| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Sun, Way" <Way(dot)Sun(at)sciatl(dot)com> |
| Cc: | pgsql-interfaces(at)postgresql(dot)org |
| Subject: | Re: libpq: PQexecParams, binaryFormat and float |
| Date: | 2007-06-29 20:27:18 |
| Message-ID: | 8175.1183148838@sss.pgh.pa.us |
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| Lists: | pgsql-interfaces |
"Sun, Way" <Way(dot)Sun(at)sciatl(dot)com> writes:
> float loadavg;
> loadavg = htonl(1.23);
It seems entirely unlikely that that will produce a byte-reversed float
value; what I think will happen is that the byte-reversed value of
integer 1 will be converted into a host-format float and stored into
loadavg.
AFAIK you can't really do this in C without a union. Take a look at
pq_sendfloat4 and pq_getmsgfloat4 in the backend for examples.
regards, tom lane
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